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Added distance vector support for CircleGeometryProcessor

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This CL's base is the CL that sets up the distance vector field req. exposure: https://codereview.chromium.org/2114993002/

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2190023002

Committed: https://skia.googlesource.com/skia/+/779e1924eaf7c5652dee93e0e8e975bbf5723b37
Review-Url: https://codereview.chromium.org/2190023002
This commit is contained in:
dvonbeck 2016-08-01 11:37:45 -07:00 committed by Commit bot
parent f1ac18229c
commit 68f2f7dc42
1 changed files with 15 additions and 2 deletions
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17
src/gpu/GrOvalRenderer.cpp
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@ -83,10 +83,13 @@ public:
fStroke = stroke;
}
bool implementsDistanceVector() const override { return true; };
const Attribute* inPosition() const { return fInPosition; }
const Attribute* inColor() const { return fInColor; }
const Attribute* inCircleEdge() const { return fInCircleEdge; }
const SkMatrix& localMatrix() const { return fLocalMatrix; }
virtual ~CircleGeometryProcessor() {}
const char* name() const override { return "CircleEdge"; }
@ -126,14 +129,24 @@ public:
args.fTransformsOut);
fragBuilder->codeAppendf("float d = length(%s.xy);", v.fsIn());
fragBuilder->codeAppendf("float edgeAlpha = clamp(%s.z * (1.0 - d), 0.0, 1.0);",
v.fsIn());
fragBuilder->codeAppendf("float distanceToEdge = %s.z * (1.0 - d);", v.fsIn());
fragBuilder->codeAppendf("float edgeAlpha = clamp(distanceToEdge, 0.0, 1.0);");
if (cgp.fStroke) {
fragBuilder->codeAppendf("float innerAlpha = clamp(%s.z * (d - %s.w), 0.0, 1.0);",
v.fsIn(), v.fsIn());
fragBuilder->codeAppend("edgeAlpha *= innerAlpha;");
}
if (args.fDistanceVectorName) {
fragBuilder->codeAppend ("if (d == 0.0) {"); // if on the center of the circle
fragBuilder->codeAppendf(" %s = vec2(distanceToEdge, 0.0);", // avoid normalizing
args.fDistanceVectorName);
fragBuilder->codeAppend ("} else {");
fragBuilder->codeAppendf(" %s = normalize(%s.xy) * distanceToEdge;",
args.fDistanceVectorName, v.fsIn());
fragBuilder->codeAppend ("}");
}
fragBuilder->codeAppendf("%s = vec4(edgeAlpha);", args.fOutputCoverage);
}